My Medical Philosophy: Three Parallels Between Modern Pharmacology and Traditional TCM Theory

Modern pharmacology studies the interactions between drugs and the body and their mechanisms, elucidating the laws of drug pharmacodynamics and pharmacokinetics by modern scientific methods. Traditional Chinese materia medica, guided by TCM theory, studies a drug's nature, flavor, meridian entry, effects, indications, and compatibility. The two belong to different theoretical systems: the former is based on experimental science, the latter on the holistic view and pattern differentiation and treatment.

Yet a deeper comparison of their theoretical frameworks reveals several striking parallels in how they understand the rules of drug action. This article examines three aspects—excitation and inhibition of drug action, selectivity of drug action, and prophylactic/therapeutic action—corresponding respectively to the TCM principle of "reduce what is in excess, supplement what is insufficient," the TCM theory of meridian entry (gui-jing), and TCM pattern differentiation and disease-based treatment, exploring the inner affinities between the two systems.

I. Excitation and Inhibition of Drug Action and the TCM Idea of "Reducing Excess, Supplementing Deficiency"

Modern pharmacology holds that excitation and inhibition are the two basic actions of drugs. Excitation means a drug raises an organ's existing function—for example, epinephrine speeds the heart and raises blood pressure, and furosemide increases urine output. Inhibition means a drug lowers an organ's existing function—for example, omeprazole reduces gastric-acid secretion, and diazepam lowers central nervous system excitability. These two concepts are the foundation of pharmacology and an important basis for rational clinical use.

The idea of "reduce excess, supplement deficiency" comes from Laozi's Daodejing and the TCM classic Huangdi Neijing; it is one of the basic principles of TCM treatment. Its core is this: disease arises from imbalance of yin and yang and disharmony of qi and blood; the goal of treatment is to "reduce the excess" to eliminate overabundant pathological factors and "supplement the deficiency" to restore weakened healthy qi.

For example, for ascendant liver yang, pacifying the liver and subduing yang is "reducing excess"; for deficiency of qi and blood, boosting qi and nourishing blood is "supplementing deficiency." This principle embodies TCM's holistic regulatory approach—achieving treatment by restoring the body's dynamic balance.

Modern pharmacology's excitation and inhibition parallel, in logical structure, the TCM principle of "reduce excess, supplement deficiency." Specifically:

First, excitation corresponds to "supplementing deficiency." When an organ's function is low, an excitatory drug can raise its functional level, matching the TCM idea of "when deficient, supplement it." For example, epinephrine used in rescuing anaphylactic shock to raise blood pressure corresponds to TCM's use of yang-warming and qi-boosting methods to rescue the critical condition of yang collapse; TCM yang-supporting medicinals such as aconite, cinnamon bark, and ginseng indeed strengthen the heart and raise blood pressure.

Second, inhibition corresponds to "reducing excess." When an organ's function is overactive, an inhibitory drug can lower it, matching the TCM idea of "when excess, drain it." For example, omeprazole inhibits gastric-acid secretion to treat peptic ulcer, corresponding to TCM's heat-clearing and fire-draining methods that clear the pathological state of exuberant stomach fire.

Third, both embody the therapeutic idea of "regulating balance." Pharmacology restores normal organ function through excitation or inhibition; TCM restores yin-yang balance through "reducing excess and supplementing deficiency." Though their theoretical languages differ, their core goal is the same—to return a body that has deviated from normal to balance.

II. Selectivity of Drug Action and the TCM Theory of Meridian Entry

Selectivity of drug action means that most drugs, at therapeutic doses, act on a particular tissue or organ especially strongly while acting little or not at all on others. Note the emphasis on therapeutic dose: at too low or too high a dose, a drug may show no selectivity.

Drug selectivity determines the drug's range of action in the body; it is the basis of drug classification and the main basis for clinical selection. A highly selective drug acts narrowly, with strong targeting and few adverse effects; a poorly selective drug acts broadly, with weak targeting and more adverse effects. Selectivity is relative: as dose increases, the range of action widens and selectivity falls.

There is a parallel concept in Chinese materia medica: the drug's meridian entry (gui-jing), which holds that certain drugs have specific effects on a given meridian or meridians. This theory is intrinsically consistent with the modern pharmacology concept of selectivity.

Meridian-entry theory is central to Chinese materia medica; TCM holds that certain drugs have a specific affinity and tendency of action toward a given meridian (zang-fu and channels). For example, Platycodon enters the lung meridian and is good at treating lung-system diseases; Bupleurum enters the liver-gallbladder meridians and is good at coursing the liver and resolving depression. Meridian-entry theory guides clinical drug selection, letting drugs act precisely on the diseased zang-fu and channels, improving efficacy and reducing adverse effects.

Modern pharmacology's selectivity and TCM meridian-entry theory are, in essence, two roads to the same destination:

First, both emphasize a drug's "targeted action." Pharmacology holds that a drug selectively acts on specific tissues and organs; meridian-entry theory holds that a drug has an affinity for specific channels and zang-fu. Though their language differs—the former based on molecular targets such as receptors and enzymes, the latter on channel-zang-fu theory—both recognize that a drug is not evenly distributed throughout the body but acts preferentially on particular sites.

Second, both guide precise clinical drug use. Pharmacology classifies and selects drugs by selectivity; meridian-entry theory guides pattern-based selection by a drug's meridian entry. Both aim at "the medicine reaching the disease site" and raising treatment targeting.

Third, both recognize the relativity of action. Pharmacology notes that selectivity falls as dose rises; meridian-entry theory also acknowledges the phenomenon of "one drug entering several meridians"—most drugs enter not one but multiple meridians, and their tendency can be changed by compatibility. Both reflect a deep recognition of the complexity of drug action.

III. The Prophylactic and Therapeutic Action of Drugs and TCM Pattern- and Disease-Based Treatment

Modern pharmacology divides a drug's prophylactic and therapeutic action into three types: prophylactic action, etiological treatment (treating the root), and symptomatic treatment (treating the branch). Prophylactic action means using a drug before disease arises to prevent it—for example, vaccinating against infectious disease, or using antiplatelet drugs to prevent thrombosis. Etiological treatment means treating the cause of disease and eliminating the pathogenic factor—for example, using antibiotics to kill pathogens, or insulin to treat diabetes. Symptomatic treatment means treating the symptoms of disease and relieving the patient's suffering—for example, using antipyretics to lower fever, or analgesics to relieve pain.

Traditional TCM likewise has the idea of disease prevention, stressing that "when healthy qi is secured within, pathogen cannot invade," and advocating "treating the not-yet-diseased"—intervening before disease arises or worsens. At the same time, TCM follows two principles in treating disease: pattern differentiation and treatment, and disease identification and treatment. Pattern differentiation and treatment selects the treatment according to the patient's specific pattern (such as cold, heat, deficiency, excess, exterior, interior, yin, yang), embodying individualized treatment; disease identification and treatment selects treatment according to the disease name and pathological features, embodying recognition of what diseases share.

Modern pharmacology's classification of prophylactic and therapeutic action parallels, in logical structure, TCM pattern differentiation and disease identification. Specifically:

First, prophylactic action corresponds to TCM's "treating the not-yet-diseased." Pharmacology stresses using drugs before disease arises to prevent it—for example, statins to prevent cardiovascular disease, or anti-osteoporosis drugs to prevent fractures. TCM stresses that "the superior physician treats the not-yet-diseased," using constitution regulation and strengthening healthy qi to prevent disease. Both embody the medical idea of "prevention first"—reducing disease risk through early intervention.

Second, etiological treatment corresponds to TCM disease identification and treatment. Pharmacology's etiological treatment targets the cause—for example, antivirals for viral infection, or antihypertensives for high blood pressure. TCM disease identification selects treatment by disease name and pathology—for example, using yin-nourishing and heat-clearing methods for "xiao-ke disease" (roughly diabetes), or blood-activating and stasis-resolving methods for "xiong-bi" (roughly coronary heart disease). Both emphasize treating the essence of disease—the "root."

Third, symptomatic treatment corresponds to TCM pattern differentiation and treatment. Pharmacology's symptomatic treatment targets symptoms—for example, antitussives for cough, or antidiarrheals for diarrhea. TCM pattern differentiation selects treatment by the patient's specific pattern—for example, acrid-warm exterior-releasing methods for wind-cold common cold, or acrid-cool exterior-releasing methods for wind-heat common cold. Both emphasize relieving symptoms—the "branch."

Fourth, both embody the idea of "treating both branch and root." In real clinical practice, Western medicine often combines etiological and symptomatic treatment, and TCM combines pattern differentiation with disease identification, so that both branch and root are addressed. It must be noted that treating the root is medicine's ultimate pursuit, but at humanity's present medical level, neither TCM nor Western medicine can treat the root for many diseases; being able to treat the branch is already no small thing.

Conclusion

Though modern pharmacology and traditional Chinese materia medica belong to different bodies of knowledge, comparison reveals a logical isomorphism between excitation/inhibition and "reduce excess, supplement deficiency"; an essential affinity between selectivity and meridian-entry theory; and a shared spirit between prophylactic/therapeutic action and pattern- and disease-based treatment.

These three parallels suggest that Chinese and Western medicine are not diametrically opposed in understanding the rules of drug action but can complement and verify each other from different angles. In contemporary medical development, promoting dialogue and integration between the two systems deepens our understanding of drug action and supports more precise, safer, and more effective clinical medication.